v1.6.4 (#139)

* v1.6.4

* Fix clippy warning

Fix CI/CD

Fix argument parsing and update deps (#114)

- Fix argument parsing
- Bump dependencies
- Change to Blue Oak license
- Add caching to CI

Resolves #110

Add new rainbow setting (#105)

Resolves #102

Use `--rainbow` to set the new setting, the number is the hue in degrees to shift each pipe. Only applies to RGB mode, defaults to None/0, which means no change in hue.

Bump version to 1.4.7 (#99)